Turret-lathe.



J. C. POTTER & J. JOHNSTON.

TURRET LATHE. APPLICATION FILED MAR. 27, 1905.

Patented Sept. 30, 1913.

5 SHEETS-SHEET 1.

n NN.. iN; www a J. O. POTTER & J. JOHNSTON.

TURRBT'LATHE. APPLIGATION FILED MAR. Z7, 1905.

1,074,561,` Patented sept. 30, 1913.

5 SHEETS-SHEBT 2.

@vi/Imaam jmwwtod J. O. POTTER & J. JOHNSTON.

` TURRET LATHE.

APPLICATION FILED MAR. 27, 1905. 1,074,561( Y Patented Sept. 30, 1913.

5 SHEETS-SHEET 3.

@wi/hmmm J. O. POTTER & J; JOHNSTON.

l TURRET LATHE.

APPLICATION FILED MAR. 27, 19054 1,074,561. Patented Sept.3o,1913.

5 sHBETe-sHBET`4.

J. O. POTTER & J. JOHNSTON.

TURRET LATHE.

APPLICATION FILED MAR. 21, 1905.

1,074,561. Patented sept. 30,1913.

5 SHEETS-SHEET 5.

lnarran sauras natuur ortica.

JAMES C. POTTER .AND JOHNJOHNSTON, OF PAWTITCKET, RHODE ISLAND, ASSIGNORS TO POTTER AND J` OHNSTO1\TJllIIAGIElIIhHi.-v COMPANY, OF PAWTUCKET, RHODE ISLAND,

A CORPORATION 0F RHODE ISLAND.

"runner-Lerne.

. .eppl-ieaticm filed March 27, w65. :Serial-No. 25%;344.

To all whom t may concern:

Be it known that we, JAMES C. :Po'r'rnn and JOHN JOHNSTON, of Pawtucket, in the county of Providence, and in the `State of Rhode Island, haveinvented a certain new and useful Improvement in Turret-Lathes,. h

and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the raccomlfianying drawings, in which* Figure l is a top plan View of alathe embodying our invention; Fig. 2 is arear elevation of the lathe illustratedV l'in Fig. l; Fig. 3 is an end elevation, of such lathe; Fig. 4 is a vertical, longitudinal sectional view of the said lathetaken on the line 4-4 of Fig. 1; Fig. 5 is a sideelevation ofthe portion of the lathe showing the tripping mechanism for the turret revolving mechanism. Fig. 6 shows details in perspective of parts illustrated in Fig. 5.

The object of our invention 'has been'to provide a turret lathe which shall have among others the following advantages that o f causing theturret to be-Clrainped t0 its slide during the cuttingby each tool,the turret being ofcourse unclampedto .permit its revolution; that of having mechanism for revolving the turret, which mechanism shall be capable of operation atthe highest practicable speed and that shall be independent of the speed of'travelof the turret slide, so that the maximumpractica'l speed of revolution of the turret can be maintained, whether the speed of travel of the turret slide be high or low;-ofhaving mechanism by which the turret can-be"revolved any desired number of stations between any two successive reciprocations ofthe turret slide; that of having means by which 'the turret can be adjusted toward or from the work without moving the turret-reciprccat ing mechanism; that of having means by which the turret can be released 'from .its turning mechanism, so that the turret can be revolved by hand without'actuating the turret-reciprocating vl'or `turret turning .mechanism; that of having the turret mounted upon a slide that rests directly upon .the ways on the lathe-bed while also having'promounted ta slidelB, the slide resting directly on the ways of thelathe and carrying a turret' C. Between the ways of the bed, a plate or bar D is reciprocated by any desired mechanism, preferably by means of a drum aving cams secured toits periphery,.such camsiacting on a in or roll secured tothe barD, whereby t ebar is reciprocated at the speed and length of stroke which it is desired to give the turret. The'turret slide B isi secured tofth'e bar D as by 'T-head bolts d passing .through holes'inthe slide and engaging a .T -shape slot inthe bar llt-he; slot extending parallel'to the ways of the bed andserving to permit fastening-the turret slide 'to such bar at any desired point, so that the field of operationof the tools f can be located close to or ffarther away from'the lathe head, and this without changing'any of the cams on the drum which Adrives -the bar D. A

In order that: the' turret slidemay befreadily shifted along ythe bar D,we provide a rack E which is-secured toi or formed on the bar D, the rackbeingfengagedbyia pinion e lon a shaft e that is journale'din-the turret slide, the said shaft prefer-ably having a squared end for engagement by asocketed crank. Y

Thehead 0 of the turret C rests upon a ring F on the turret-slide, and-a'neck c on the turretis j'ournaled withinsuch ring: A stem 02 on the turret is journaled in the turret slide. A clamping bolt 'H is keyed in a hole in-the bed and-extends uplthrough an axial Ahole in the turret stem. The upper end of the bolt carries a Vwasher h that is held against-a shoulder la Vonthe bolt by 'a nut h2 that lis Elocked on the bolt. 'On the lower end offthe boltH a nut I, inthe form of a pinion, isithr'eaded on thebolt;rand such nut, on vbeing screwed up, may be madeto bearon a hardenedwasher1K,thelatter supporting a ring l: khaving bearing balls k therein, upon whichfball's rests another hardened ring llc?. rPhe ring k2 is directly 'beneathra.surface'i'cPl onthe turret-slide, against which surfaceth'esaid :ring is adapted to be forced by screwing'up the pinion nut. This action causes the. bolt 1H, and with it -the turret, to rbe-dra-wn down, so'that'the .turret canbe securely clamped to its slide. As the pinion-nut is tightened, the lower, hardened washer K can turn with the nut, the balls ret slide, such shaft being permitting such action; and the friction of tightening the nut is thus made ver small.

At the base of the turret stem is eyed a disk L, the said disk being provided with equally spaced pin's Z, there being twice as many pins as there are stations on the turret; and such disk is also provide-d with notches Z for engagement with a locking bolt to be later described. The pins Z are adapted to be engaged by teeth m on a disk M that is journaled on a stud m secured in the turret slide. The number of teeth m is equal to the number of pins Z between two turret stations, in the instance chosen for' illustration, there bein two teeth. Thus, at. every revolution of t e disk M the turret will be revolved one station.

Upon the under side of the disk M, a beveled ear N is fastened, and such gear is engagecgl by a beveled pinion O that is secured on -a horizontal shaft P j ournaled in the turret slide. The shaft P extends, preferably, beyond the'ways of the bed, and upon its extended end 1s provided with a beveled gear Q. A shaft R is journaled in bearings formed by a box-like extension S that is formed on or secured to the side of the turreferably arallel to the ways of the be The sha t R has a clutch-member U ixedthereon, and a clutch-member u journaled thereon. The clutch-member u is formed onor secured to a gear V, there bein a neck v between the gear and clutch mem er for en agement of a pin w on a shipper lever W. shaft X is journaled'in the extension S parallel to the shaft R, and is provided with a pinion Y which meshes-with the pinion V. The shaft Y is, also, provided with a belt pulley Z that is preferably belted to the shaft ,by which the lathe is driven. Any other means for driving the clutch-member u at a uniform rate of rotation may be substituted for those which have been described. -The lever W is mounted on a shaft A which is journaled transverse to th'e ways in vthe turret slide, and such lever is provided with an arm w thatcarries an antifriction roller wz, which latter en ages a ath ca m B in the side of agear C which atter meshes with a pinion on the shaft P. The pro ortion of the gearing is such that the ear revolves once for every station of t e turret. The lcam B is circular from a point b around to a point b', the remainder of the cam approaching the center ofthe gear to a= point b2 where there is a sharp inclination outward to connectwith the circular portion of the cam. The cam is s0 formed that when the roller lw2 isin thel circular portion of the cam, the clutch-member u will be held in y engagement withvthe clutch-member U, and

'when thefroller enters the inclined portion ofthe said cam, the lever will be swung to vdisengage the-clutch members When the clutch members are disengaged, the cam B will stop with the roller lw2 in the portion b3 of the cam which connects the circular portion with the inclined or spiral portion, and the clutch-members can, therefore, be rengaged by'swingng the lever W on its fulcrum. This is accomplished by turning the shaft A in the following manner: The end of the said shaft, opposite to that on which the lever is secured, is'provided with a yshoulder D", formed as by cutting away a portion of the shaft, and the said shoulder.

1s engaged by a shoulder e2 formed on a rod, or bolt, E mounted in a vertical hole in the turret slide. The bolt E is depressed by a spring e, .and on the rearward edge of its bottom is provided with a Surface e5 inclined to the horizontal, and forward of such surface is provided with a vert-ical surface e4 inclined forward in a direction toward the ways. A spring latch F is fixed on a pin f that is pivoted in a block G that is provided wlth a T-slot g, the latter `receiving a T-sha ed guide H that is secured to the side of) the turret slide. The block G is provided with a set screw G2 by which it can be securedin any desired position. The pin f is cut away to form a shoulder f against which bears a block I-I2 that is pressed toward the saidshoulder by a spring ha. The latch F thus tends to turn inward against a pin f2 secured upon theblock G. The latch F is provided with an inclined surface f3 at its forward end, which is adapted to ride under the inclined surface e5 on the bolt E', and thus to raise the bolt. The said latch is, also, provided with a vert-ical inclined surface f* which is adapted to ride against the surface e4 .on the bolt E', ,and thus to cause 'the latch tov swing outward without disturbing thesaid `bolt when the turret slide is movlng in a forward direction. When the latch rides under :the bolt E it raises the latter', oscillates the shaft A', swings the lever W t` cause the clutch member u to engage the clutch memberU and at the same time to cause the roller 102 to rise into the path of the-circular 'portion of the cam B. rlhey clutch members, being engaged, causev the gearC: to revolve and thus cause the roller fm2 to fully'enter the circular portion of the camywhic'h vprevents the lever W from unshipping .the 1 clutch after the.

latch F has passed from beneath the bolt E. The clutchv is thus' maintained in engagement while the rollerrw2- passes through the circular portion Vof. the cam, and until the inclined ortion ofthe cam permits the lever W to lbe swung." 'The said lever is given a'tendency toswing in a 'direction to disengage the clutchl by. a spring bolt I mounted in a cover of the box like projection S, the said bolt being depressed by a spring z'.

It is- 'obvious that the vlatch F` canbe made of suflicient length to keep the bolt Lora-,ter

may be wished-for. 'Ihe latch may, also, be-

. providedwithv aseriesl of' elevations and de.-

pressions to cause the cam'to revolve asma-ny times as desired, andat any desired times during the movement of.' the turret' slide.

The notches'Z inthe disk L are engaged by a lockingbolt K' that is mountedfto reciprocate in the turret` slide. The said locking bolt is preferably located above the disk M, and is forced into locking' position by a spring L. The locking bolt is provided with a pin L2 that is engaged by a hand lever M', the latter being pivoted, asby a screw N', upon the turret slide. The hand lever M' is provided with a cam M2, by which the lever is operated by meansof a pin O2 on the disk M. As the diskrevolves, the pin @irides against the handI lever M', moving the latter to the right as seen in Fig. l, and causing the latter to engage and move the pin L2 and with it the locking bolt, the movement t-aking place against the stress of the spring L'. After the pin OQ has passed the cam M2', the sprin returns the locking bolt and causes its beve ed end to engage one of the notches Z in the disk L. ment, ofcourse, takes place after the rotation of the turret.

The pinion nut I for lclamping the 4turret to the turret slide is operated by a rack bar P', the thread of the nut being. such that the locking movement of the rack bar is toF the right as seen in Fig. 1. Such movement of the rack bar is caused by a spring' Q2, which for compactness extends for a large portion of its length into a ,hole inthe rack bar. hen the pinion-nut I -1s to be unlocked, the rack bar is moved for'- ward by a rock arm Q3 that engages a notch p' formedin the rack bar, the lsaid rock arm beingkeyed to a sleeve R that is mounted upon the shaft A. The end of the sleeve R' opposite to that carrying the arm Q3 is provided ywith a rock arm S-" carrying an antifriction roller s' that rests upon a cam T', the latter being secured'to a side of the gear C' in which the cam B is formed. In order to leave the turret-vunclamped so that it can be rotated by hand, as, for instance, in setting the tools, the turretl slide is provided with a hole U' over the path of the rack bar, and the rack bar with a hole p2 in position to stand under the hole U when the rack bar is in unclamped position.

A pin V that is'provided with longer and shorter cylindrical ends /v' andv '112, united'by a knurled portion v3, is laced with its longer portion extending tlirough the hole i i Il', when it is desired to lock theprack bar from clamping. When the rack bar is ref pin V' drops into the hole in the rack bar and locks the bar back. it' is not desired to lock the :rack bar, the pin i's-inverted, and itsshorter cylindricalE portion is put int-o the hole X, and' thus the pin is conveniently heldy until it isdesired to use it. l

In the operation of the above described illustration ,of our invention, the rack bar 'F ils-locked in unclamped position by means of the pin V'.- The 'lf-bolts al are loosened, 'if necessary, andl the turret slide is shifted toward'- or from the work bymeans of a crank turningr the shaft e', and causing the pinion o to travel along the rack E. The T-bolts are then clamped. This adjustment of the turret slide, it will be observed, is effected without necessity for turning the cam drum or other means by which the turret slide is reciprocated. The tools are thenadjusted in the turret, the turret being unlocked when it is desired to revolve it by means of the hand lever M', the turret when unlocked being capable of revolution by hand. The lathe is then set in motion, and the pulley Z is continuousl revolved at a uniform rate of speed; he block G' is adjusted to cause the bolt E to be raised on the rearward stroke of the turret slide, and when the said bolt rides up upon the latch F', the clutch is engaged as before described, causing the gear C' and pinion T to make one or more revolutions, according as the surface ofthe latch F' isV short or long. The Y revolution of the gear C' causes the revolution of the cam 'I" which swings the sleeve R and, through the rock arm Q8, causes the rack bar P' to move against the stress of the spring Q', and to rotate the pin nut I, thus unclamping the turret. The rotation of the pinion Q then causes the rotation of the disk M, which first, by means of the pin O2, causesthe locking bolt to be withdrawn, andthen, by means of theteeth m, rotates the turret one station. rlhe locking bolt then engagesY the turret, and the rack bar P' again locks it.

It will beseen that, in the above illustrated lathe, the turret is mounted upon a slide which is directly mounted upon the ways of the lathe. The turret is thus always provided with an ample base to support it and is never, at lany moment, upon an over- I,han `ng part. The turret is not only lthus wellglsupporte'd, but each time that a tool approaches the work, the turret is not only accurately revolved to and locked in place; but it is securely clamped to the turret slide. The tool is thus supported in the firmest manner, and is capable of doing the best and most accurate work. While the turret is thus securely clamped during the operations of the tools, it can, as before described, be caused to remain unclamped, so that itl can be. revolved by hand, if desired, for adjusting the tools. The mechanism for of the movement of the turret slide so that the revolution of the turret can take place at the highest speed which is practicable without any reference to the speed travel of the turret slide. Much valuable time is thus saved. The turret-revolving mechanism possesses the further advantage that the turret can be revolved any desired number of' stations between two reciprocations of the turret slide. This has the advantage of enabling a lesser number of tools to ,be used than the full number of stations in the turret without involving any useless reciprocations of the turret slide. The turretslide reciprocating mechanism, it will be observed permits the adjustment of the turret so that its field of operations shall be near to or farther from the head stock of the lathe without any necessity for revolving the cam drum.

By describing in detail a particular construction 'or arrangement we do not intend to limit ourselves beyond the terms of our several claims, or requirements of the prior art. It is evident that many changes can be made in the above described construction which will be Within the scope of our inl vention.

Having thus described our invention, what we claim is l. In a turret lathe, the combination of a turret, a support therefor, means for revolving the turret, and means for clamping the turret, comprising a threaded stem on the turret projecting through the support, a pinion nut engaging the other side of the support from the turret, and a rack-bar engaging said pinion-nut, a spring for mov-` ing said rack-bar in a direction to clamp the nut, and a cam-operated lever for moving said rack-bar in the opposite direction.

2. In a turret lathe, the combination of a turret, a support, means for revolving said turret, and means for clamping said turret during cutting operations, said means for clamping comprising a stem on said turret passing through said support, a pinionnuton the opposite side of said support from said turret, a rack-bar engaging said pinionnut, a spring for moving said rack-bar inl a direction to clamp the turret, means for positively moving the rack-bar in the opposite direction, and a latch adapted to secure said rack-bar in unlocked posit-ion.

3. In a turret lathe, the combination of. a turret, a support for the turret with which it is movable toward and from the work, means for moving said support, a turret clamp comprising independent members that are movable toward and from each other, and automatic means positively acting on the clamp to release the turret, operated independently of the turret-support moving j means.

4. In a turret lathe, the combination of a Iturret, a support for the turret with which it is movable toward and from the Work, means for moving said support, a turret clamp comprising a bolt having a turret engaging member and a turret support engaging member, and automatic means positively acting on the clamp to release the turret, operated independently of the turretsupport moving means.

5. In a turret lathe, thecombination of a 'lal turret, an automatic clamping device for the v turret embracing a pinion, and a clamping member actuated by the rotation of the pinion, a rack bar, and a spring for moving theu rack bar in one direction, and a latch consisting of a pin to engage a shoulder on'the rackbar. i l

6. In a turret lathe, the combination of a turret, a support therefor, a turret clamping device embracing a pinion and a clamping member actuated by the'rotation of the pinion, and a spring actuated rack bar, and an automatic latch to engage said rack bar when in turret` unclamping position, 4consisting of a pin having a bearing in thenturret, and consisting of a body portion provided with longer and shorter ends, the longer end being adapted to engage a shoulder on the rack bar.

7. In a turret lathe, the combination of a turret, a support therefor, means for rotating said turret, means for clamping said turret, said means for clamping'comprising a stem on the turret and passing through la latch adapted to engage said rack when in unclamped position. r

8. In a turret lathe, the combination of a turret, a support therefor, a shaft mounted upon and moving with the support, said shaft .extending parallel to the waysA on which the support moves, whereby the shaft may be driven from the counter shaft of the f. lathe, notwithstanding its movements with the turret support, and means formoving the turret support toward and from` the Work, independent of said shaft, and gearing between the same and the turret.

9. In a turret lathe, the combination of a turret, a support therefor, means for reciprocating said support'toward' and from the work, and means for rotating the turret, 'said last-mentioned means comprising a uniformly drven shaft on said support, gearing for rotating said turret, a` clutch forconnecting said gearing to said shaft, means for engaging said clutch, sald means comprising a part movable transversely to the formly driven shaft on said support, gearing for rotating said turret, a clutch for connecting said gearing to said shaft, means for engaging said clutch, said means comprising a part movable transversely to the line of movement of said support, a projection secured to a relatively immovable Apart of the lathe inthe path of movement of said last-mentioned part, and means for maintaining the members of said clutch in enagement lduring a movement of the turret 'om one Station to another. 11. In a turret lathe, the combination of a turret, a support therefor, means for reciprocating said support toward and from l the Work, means for rotating the turret, said last-mentioned means comprising a4 uniformly driven shaft on said support, gearing for rotating said turret, a clutch for connecting said gearing to said shaft, means for engaging said clutch, said means comprising a part movable transversely to theline of movement of said support, a rojection secured to a relatively lmmovab e part of the lathe in the path of movement of Said last-mentioned part, .and means for maintaining the members of said clutch in engagement during a complete revolution, and for releasing said clutch at the end of such revolution.

12. In a turret lathe, the combination of a turret, a turret slide means for` reciproeating said slide, a uniformly-rotating shaft on said slide, gearing for, rotating said turret, a clutch for connectin said gearing to said shaft, a shipper lever'or operating said clutch, said lever being mountedu ona shaft journaled on said slide and exten ing transv versely to the line of movement thereof, "a

path-cam driven` by the aforesaid gearing,

said path-cam having a circular portion, a

spiral portion connected thereto, and an oblique portion connecting the ends of said circular and spiral portlons, said shipper lever having a pin adapted to be engaged by saidr cam, said lever-shaft having a shoulder whereby it may be turned, a rod mounted on 4said turret-slide and adapted to engage said shoulder, and a projection mounted on the lathe bed and adapted to raise said rod as the latter rides over said projection.

13. In a turret lathe, they combination of Va turret, a turret slide, means for reciprocat-ing said slide, a uniformly-rotating shaft on said slide, gearing for rotating said turret, a clutch for connecting said gearing to said shaft, a shipper lever for operating said clutch, said lever being mounted upon a shaft journaled on said slide and extending transversely to the line of movement thereof, a path-cam driven by the aforesaid gearing, said path cam having a circular portion, a spiral portion connected thereto, and an oblique portion connecting the ends of said circular and spiral portions, said shipper lever having a pin adapted to be engaged by said cam, said lever-shaft having a shoulder whereby it may be turned, a rod mounted on said turret-slide and adapted to engage said shoulder, and a projection mounted on the lathe bed and adapted to raise said rod as the latter rides over said projection, said projection being pivoted at its rear end and having an inclined shoulder, whereby said rod may turn said projection out of the Way upon the forward stroke of the turret slide. 14. In a turret lathe, the combination of a turret, a reciprocating turret slide, a constantly driven shaft, gearing between the shaft and the turret for rotating the turret, a clutch for connecting and disconnecting the gearing and shaft, a lever for actuating the clutch, a cam-block mounted stationarily relative to the turret slide, and a part on the latter for actuatingthe lever, in Whose path the cam-block is situated, said cam-block being removable and interchangeable With another.

In testimony that We claim the foregoing We have hereunto set our hands.

JAMES C. POTTER. JOHN JOHNSTON. Witnesses:

EARL H. ROBERTS, CHAS. W. ROBERTS. 

